Dispensing – With discharge assistant – Container with follower
Patent
1998-08-12
2000-05-30
Douglas, Steven O.
Dispensing
With discharge assistant
Container with follower
222399, B65B 104
Patent
active
060681640
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a hand greas gun with a lever-operated piston pump and a tubular grease supply reservoir. More specifically, the invention relates to a portable device for pressure delivery of a highly viscous lubricating material, which device substantially consists of a cylindrical container with a supply of the lubricating material, and a reciprocating delivery pump, forming part of the head of the device. The reciprocating pump is manually operated through a lever arm, and is connected with its suction port to the container and with its delivery port to an end dispensing nozzle. Such kinds of devices are also known as syringe grease guns.
As it is known, in the manual grease guns of the kind mentioned above the high viscosity of the material involved makes it necessary to combine the action of the piston pump on the head of the device with a further thrust, which helps the grease mass to flow towards the delivery end of the container, by pressing the mass from the rear end of the container. For this reason, in the most widespread grease guns, either of the type refillable with grease in bulk or of the type for use with commercial grease cartridges, there is provided a back pressure piston, slidable within the tubular container. The pressure piston pushes the grease mass towards the head piece, moving gradually forward as the grease supply diminishes.
In the conventional syringe grease guns, the pressure piston is biased by a helical compression spring, which is housed in the rear region of the cylindrical reservoir. The compression spring is loaded, before filling the container with grease, by pulling a suitable draw rod coaxial to the spring. One end of the draw rod engages the pressure piston at the center thereof, while the distal end of the rod is provided with a hook or a handle, and extends out of the rear end of the cylindrical container. Specifically, to load the grease gun, the head assembly with pump and lever arm is first removed from the device, by unscrewing the screw cap and seal through which the assembly is connected to the front end of the tubular container. Then, the draw rod handle is grasped and the pressure piston is retracted against the bias of the spring, which is thus compressed against the rear inner wall of the container. Normally, the draw rod is provided with a locking element which cooperates with a mating element fixed on the rear region of the tubular container, so that the draw rod may be blocked in its fully retracted position, almost completely extending out of the reservoir, which corresponds to the position of maximum compression of the spring and to that of maximum retraction of the pressure piston within the cylindrical body of the container.
While the pressure piston is being kept in this position, the tubular reservoir is filled with grease in bulk, by manually introducing it from the open front end of the cylinder. In the alternative, the tubular reservoir is loaded with a grease cartridge, which is also inserted from the front end of the cylinder, after having removed both end covers of the cartridge. After closing the device by again screwing the head assembly thereon, the draw rod may be released from its locked position, thus releasing the spring, and the latter may thus exert its pressure, through the pressure piston, on the grease mass in the reservoir. It is clear that, in the simplest case where the draw rod is integral with the pressure piston, the rod protrudes from the rear end of the grease gun a length corresponding to the degree of loading of the tubular container, and is gradually retracted within the container as the grease supply decreases.
During operation, the spring and pressure piston assembly pushes the grease towards the front end of the tubular container. A small aperture is provided on the front end, communicating with the intake port of the reciprocating pump. When the lever of the pump assembly is raised, the pump piston is caused to move backwards in its cylindrical chamber, thus opening th
REFERENCES:
patent: 1584863 (1926-05-01), Josepson
patent: 1926398 (1933-12-01), Nielsen
patent: 1976061 (1934-09-01), Eastman
patent: 2463113 (1949-01-01), Klein
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